package model;
import com.mysql.jdbc.Connection;
import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import javax.sql.DataSource;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * Creat with IntelliJ IDEA
 * Description:使用这个类和数据库建立连接
 * User:WZW
 * Date:2022-08-06
 * Time:22:46
 */
public class DBUtil {
    public static final String URL = "jdbc:mysql://127.0.0.1:3306/blog_system?characterEncoding=utf8&useSSL=false";
    public static final String USERNAME = "root";
    public static final String PASSWORD = "";

    public static volatile DataSource dataSource = null;

    public static DataSource getDataSource() {
        if (dataSource == null) {
            synchronized (DBUtil.class) {
                if (dataSource == null) {
                    dataSource = new MysqlDataSource();
                    ((MysqlDataSource)dataSource).setURL(URL);
                    ((MysqlDataSource)dataSource).setUser(USERNAME);
                    ((MysqlDataSource)dataSource).setPassword(PASSWORD);
                }
            }
        }
        return dataSource;
    }

    public static Connection getConnection() throws SQLException {
        return (Connection) getDataSource().getConnection();
    }

    public static void close (Connection connection, PreparedStatement statement, ResultSet resultSet)
            throws SQLException {
       if (connection != null) {
           connection.close();
       }
       if (statement != null) {
           statement.close();
       }
       if (resultSet != null) {
           resultSet.close();
       }
    }
}
